To clarify...Fair few visiting exec a/c to Southend were "reported" as LTN...STN...etc "diversions".
Re the bookings fair go but anecdotal evidence suggests in some instances otherwise.
I`m suggesting that a/c may have had slots booked at LTN/STN BEFORE the "curfew" hour but in a just in case scenario booked SEN too.
Execs already out of position may then be slotted out at LTN/STN for the return both with the R/W & FBO`s as the new days movements dealt with.
Anyways...Anecdotes & conjecture.